I have the exact same thing happening to my car. I had it checked out by the dealer before I reset the code and everything checked out fine. My exhaust had come loose out of the left hanger but that was an easy fix. Fast forward 3 weeks and I started the car for the first time in a couple of days and the code is back on. I am convinced it might be an exhaust leak or a bad sensor. I tested for vacuum leaks and checks the MAF sensors as well and they all checked out. Maybe a bad O2 sensor?
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